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@GIZBUG T-Mo is GSM, so look for an ipsw explicitly tagged for that version if they are. What model and capacity are you using?

EDIT: Looks like you’re using a 7+ actually. What is the model number within the About section?
 
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P.S. The model number reported is only unique to the type of iPhone and capacity, and is not a personal identifier that can be compromised.
 
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